ENERGY
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2022
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IF 8.857
Xiaopeng Shi,Pan Li,Xianhua Wang,Jiande Song,Shuqi Fang,Chun Chang,Shusheng Pang
The main purpose of this work was to explore the effect of metal modified biochar and multi-catalysts on improving the quality of products by microwave pyrolysis (MVP) of biomass. Single-component catalysts and multi-catalysts were prepared by Zn/Zr impregnation methods. The prepared catalysts were evaluated by XRD , BET, FT-IR and SEM. The properties, composition and product distribution of bio-oil and bio-syngas were analyzed. The results showed that ZSM-5 obtained more bio-oil (42.16 wt%) at the expense of gas product yield, and BC obtained the highest gas yield (43.10 wt%). Zn promoted the selectivity of aromatic hydrocarbons in bio-oil, Zr could effectively improve the yield of syngas and upgrading bio-oil, respectively. Zr-modified multi-catalyst was prepared, and the highest syngas yield (91.54 vol%) and aromatic hydrocarbon products were obtained. Among them, the selectivity of monocyclic aromatic hydrocarbons (MAHs) reached 21.82%. The mechanism of MVP of biomass under the effect of Zn/Zr modified different catalysts was proposed. The study has successfully demonstrated an approach for producing high-value bio-oil and bio-syngas from microwave multi-catalyst pyrolytic system.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Jingyuan Shang,Guangbin Fu,Zhenping Cai,Xiang Feng,Yongxiao Tuo,Xin Zhou,Hao Yan,Chong Peng,Xin Jin,Yibin Liu,Xiaobo Chen,Chaohe Yang,De Chen
Valorization of biomass to olefin or aromatics harbours tremendous practical value due to growing concerns about sustainable production of chemicals. Herein, the olefin or aromatics yields of ex-situ catalytic pyrolysis of pine can be regulated by impregnating Sn on hollow-structured ZSM-5 (M-ZSM-5) and microporous ZSM-5 catalysts in fixed-bed reactor, respectively. Results showed that Sn/ZSM-5 catalyst simultaneously increased medium acidic sites and maintained strong acidic sites, which obtained the maximum carbon yield of aromatics (33.77%) due to enhanced cracking and deoxygenation reactions. In addition, Sn boosted alkylation between olefin and aromatics, generating more alkylbenzene. In contrast, Sn/M-ZSM-5 catalyst produced the highest olefins carbon yield (12.39%) because the reduction of strong acidic sites and microporous volume inhibited the olefin aromatization. Moreover, olefins were easier to desorb from Sn/M-ZSM-5 due to the enhanced mass transfer ability, which weakened the alkylation reactions. The synergistic effect harbours great significance to manipulate the distribution of products.
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PubMed
高影响因子
RENEWABLE ENERGY
·
2021
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IF 8.001
Nishu,Chong Li,Meiyun Chai,Md. Maksudur Rahman,Yingkai Li,Manobendro Sarker,Ronghou Liu
Hemicellulose was extracted from rice straw, and catalyst ZSM-5 was modified by NaOH and Ni over alkaline treatment and wet impregnation method, respectively. To investigate the effects of modified ZSM-5 on selectivity of aromatic hydrocarbons, catalytic pyrolysis of hemicellulose was studied via Py-GC/MS. Significant effect has been reported for product selectivity and composition over the modified catalysts. All the modified catalysts showed better aromatic selectivity than parent ZSM-5 (P-ZSM-5). Notably, alkali modified ZSM-5 with 0.4 M concentration of NaOH (0.4 M ZSM-5) showed 36% selectivity towards aromatics with the share of benzene, toluene, and xylene (58%) and share of polyaromatics (15%) compared to others. Meanwhile, 8 wt% Ni-ZSM-5 showed the highest selectivity of aromatic hydrocarbons of 54% where the share of benzene, toluene, and xylene was 70%. This research revealed that metal modified ZSM-5 significantly influences the aromatics yield, which is essential for the production of liquid fuels and chemicals.
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高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·289-303
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IF 2.394
Suo Yange,Zhang Zihan,Zhang Zhiguo,Hu Guilin
In this work, a facile method is reported for the synthesis of ZIF-67-derived cobalt and nitrogen-doped carbon (Co-N-C) materials with enlarged average pore sizes as electrocatalysts towards oxygen reduction reaction (ORR). The pore diameters of the Co-N-C can be greatly enlarged using NaCl as an additive during the pyrolyzing process. Thermo-gravimetry (TG) results suggest that NaCl could facilitate the structural decomposition of ZIF-67, resulting in the adjusted physiochemical properties of the obtained Co-N-C materials. The CoNC-1NaCl-700 and CoNC-1NaCl-800 materials derived from ZIF-67 in the presence of NaCl at relatively high pyrolyzing temperatures (i.e., 700 °C, 800 °C) exhibit superior catalytic activity compared with the CoNC materials derived from pure ZIF-67, which could be due to their unique structures of larger average pore sizes, higher surface areas, higher contents of pyridinic-N and graphitic-N. The onset potential of the CoNC-1NaCl-800 towards ORR is 0.94 V (vs. RHE) and the half-wave potential is 0.84 V (vs. RHE), which are comparable with that of commercial Pt/C.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Yang Li,Kai Li,Bin Hu,Zhen-xi Zhang,Guan Zhang,Shi-yu Feng,Ti-peng Wang,Qiang Lu
As a value-added chiral chemical, 1-hydroxy-3,6-dioxobicyclo[3.2.1]oct-2-one (LAC) can be obtained via cellulose pyrolysis, but its yield is extremely low in the conventional pyrolysis process. Herein, novel nickel-tin layered double oxide (NiSn-LDO) catalysts were developed for the selective production of LAC from the in-situ catalytic fast pyrolysis (CFP) of cellulose. Several layered double oxides (LDOs) were prepared and evaluated via pyrolysis-chromatography/mass spectrometry (Py-GC/MS) tests for the in-situ CFP of cellulose. NiSn-LDO was determined as the most capable catalyst for selective LAC preparation, and further experiments were conducted to confirm the optimal condition to produce LAC over several essential factors of reaction temperature, Ni/Sn molar ratio in the NiSn-LDO catalyst, and catalyst-to-cellulose (CA-to-CL) ratio. The results demonstrated that LAC was sensitive to the reaction conditions, and its yield always exhibited the tide of first increasing followed with decreasing along with the increase of pyrolysis temperature, Ni/Sn molar ratio, and CA-to-CL ratio. The maximal LAC yield reached 9.11 wt% over the pyrolysis temperature of 320 °C using NiSn-LDO with a Ni/Sn molar ratio of 2/1 at the CA-to-CL ratio of 1/1, which was more than 5 times of that from the non-catalytic process (1.72 wt%). In addition, the NiSn-LDOs possessed much better catalytic capability to yield LAC with high selectivity than previously reported catalysts.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Ting Wang,Ming Xu,Fengrui Li,Yunjiang Li,Weilin Chen
Over the years, transition metal-based hybrids have been advocated as one of the most promising classes of non-noble catalysts and investigated exclusively for the electrocatalytic triiodide reduction reaction (IRR) or hydrogen evolution reaction (HER). However, there is lack of effective strategy to address their site accessibility, intrinsic activity and structural stability issues, and their successful utilization as bifunctional catalysts of IRR and HER is rarely explored. Herein, presented is a multimetal-based carbon nanotube hybrid (CoFeNiMo@NCNT), synthesized from a novel polyoxometalate (POM)-intercalated layered double hydroxide (LDH) pyrolysis strategy, as an efficient catalyst for IRR and HER. During both electrochemical IRR and HER, the regulated NCNT provides a highway for electron migration and acts as a network for I 3 − /H + adsorption. Benefitting from the features of porous structure, multimetal component and fast electron transfer, the CoFeNiMo@NCNT catalyst delivers a high power conversion efficiency of 6.46 % when assembled as counter electrode in dye-sensitized solar cell, superior to Pt benchmark. Furthermore, it mediates efficient HER with a relatively small overpotential of 209.9 mV at 10 mA cm -2 . The strategy to achieve tunable catalytic properties via in situ pyrolysis well-defined inorganic materials paves a new way to design cost-effective and efficient bifunctional catalysts.
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高影响因子
FUEL
·
2020
·
IF 5.578
Yong Huang,Shasha Liu,Yishuang Wu,Xun Zhu,Zhixiang Xu,Bin Li,Xun Hu,Hongqi Sun,Jianbin Zhou,Shu Zhang
Char surface functional group has been shown to play an important role in volatile-char interactions during biomass pyrolysis, which are known to be effective for the modification of the pyrolysis products. Using xylose and amino-modified graphitized carbon nanotube (CNT-NH 2 ) as model compounds, the contribution of the designated surface functional group to the evolution of pyrolysis volatile was investigated in this paper by combined theoretical and experimental approaches. The results showed that the interactions between xylose and CNT-NH 2 significantly prevented the ring-opening reaction of xylose to form the most typical anhydrosugar, xylosan, while the ring-contraction reaction of xylose was facilitated to yield furfural. The Density Functional Theory (DFT) calculations demonstrated that two medium hydrogen bonds were formed between the amino group and two hydroxyl groups (1-OH and 3-OH) of xylose with a binding energy of −11.67 kcal/mol, leading to diverse changes in the Mayer bond orders of xylose and thus varying pyrolysis pathways.
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高影响因子
WASTE MANAGEMENT
·
2020
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IF 5.448
Juan Luo,Junhao Lin,Rui Ma,Xing Chen,Shichang Sun,Peixin Zhang,Xiangli Liu
To study the effects of different ash/organics and C/H/O ratios on bio-fuel characteristics and energy efficiency, four kinds of sludge with different properties were used for microwave pyrolysis (800 °C). Moreover, the microwave pyrolysis reaction mechanisms of different sludge were also explored. The results showed that high-ash sludge could accelerate the frequency of polar molecule rotation in the microwave field due to the presence of oxides with dielectric properties in ash, thereby achieving faster heating rates and higher temperatures. However, compared with high-organic sludge, high-ash sludge exhibited lower bio-gas yield and higher bio-char yield. As the H/C ratio increased from 0.127 to 0.148, the bio-gas yield increased from 15.41% to 40.01%, and the content of H 2 in bio-gas and aliphatics in bio-oil increased to 36.69 vol% and 26.54 wt%, respectively. When the O/C ratio was reduced to 1.31, the content of CO and oxygenated compound in bio-oil increased to 31.25 vol% and 40.04 wt%, which lowered the quality of the bio-oil. Those consequences also determined that a mixture of sludge with different ash/organic ratios could be pyrolyzed to obtain high-quality bio-fuels and high energy efficiency. Differences in C/H/O ratios in the mixed sludge greatly affected the microwave pyrolysis heating process, which affected the pyrolysis reactions and the quality of the bio-fuels. Therefore, this study provides a theoretical basis to elevate the quality of bio-fuels and reduce microwave pyrolysis costs.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 23
·9191-9202
·
IF 11.034
Xiaojie Tian,Xinyu Bian,Zihong Zeng,Jiamin Xu,Anqi Dai,Linyao Ke,Yuan Zeng,Qiuhao Wu,Yuhuan Liu,Kirk Cobb,Roger Ruan,Yunpu Wang
Co-pyrolysis of biomass and waste plastics has the potential to produce high-quality chemicals and these resources are recycled to realize their clean and efficient utilization. However, the current co-pyrolysis technology often mixes them physically, which can cause key problems, such as large differences in pyrolysis characteristics, restricting the synergistic effect of co-pyrolysis intermediates. The purpose of this study was to construct a segmented co-pyrolysis system and use FeCl3 and MCM-41 as in situ catalysts for Choerospondias axillaris seeds (CAS) and low-density polyethylene (LDPE), respectively, to analyze the relationship between different in situ catalyst addition ratios (0%, 3%, 5%, 7% and 10%) and pyrolysis products. In addition, the product distribution of the various parts of the segmented co-pyrolysis system as well as the comparison of segmented and traditional mixed co-pyrolysis were investigated. The results showed that FeCl3 can help in promoting the conversion of hemicellulose and cellulose to furans from CAS. The relative content of furans in the liquid product reached 61.08 wt% when its addition was 7%. MCM-41 can achieve its best catalytic effect when its addition was 5% in LDPE. Furthermore, segmented co-pyrolysis can promote the Diels–Alder reaction between furans and olefins and result in the content of monocyclic aromatic hydrocarbons (MAHs) in the liquid product reaching up to 72.01 wt%. Compared with traditional mixed co-pyrolysis, the relative content of MAHs of segmented co-pyrolysis was 13.53 wt% higher and the wax yield was 14.49 wt% lower. Therefore, segmented co-pyrolysis can offer potential benefits for future industrial application, compared to a traditional co-pyrolysis process.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Zenan Gao,Peng Zhang,Wenjingsheng Ling,Yuting Yang,Jingjing Ma,Guangyu Li
Calcium carbide (CaC 2 ) production is highly energy- and carbon-intensive, creating an urgent need for feedstock upgrading to enable low-carbon operation. Herein, CaO–carbon composite pellets (CCCPs) were prepared by granulating fine CaO and semi-coke powders with a hybrid binder (coal tar pitch + polyvinyl alcohol), which balances ambient green strength and high-temperature structural integrity. The effects of pyrolysis temperature (600–1000 °C) on devolatilization behavior, Ca-bearing phase transitions, pore structure evolution, and intrinsic reactivity were systematically investigated. Thermogravimetric analysis revealed two dominant mass-loss stages: 20–600 °C, dominated by binder decomposition and Ca(OH) 2 dehydroxylation (total mass loss ∼24.67%), and 600–1000 °C, governed by CaCO 3 decomposition (mass loss ∼11.11%). With increasing temperature, pore coalescence was promoted: submicron pore volume decreased, while macropores (10–100 μm) first increased and peaked at 800 °C (highest volume fraction). Raman analysis showed that the carbon disorder degree ( A D1 / A G ) reached a maximum of 2.05 at 800 °C, indicating optimal carbon reactivity. CaO underwent progressive carbonation at 600–800 °C, and CaCO 3 decomposition initiated near 800 °C and was completed by 1000 °C. Notably, CCCPs pyrolyzed at 800 °C exhibited the highest thermal strength (13.20 MPa at 800 °C, 7.69 MPa at 1200 °C) and optimal reactivity, attributed to the synergistic effect of favorable pore structure and enhanced CaO-carbon interfacial contact. This work provides a mechanistic basis for the design of high-performance CCCPs, offering a promising waste-derived feed strategy to reduce energy consumption in CaC 2 synthesis. Download: Download high-res image (177KB) Download: Download full-size image
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Yiting Mao,Bo Cai,Ming Huang,Jie Li,Xiaohuan Liu,Wenbiao Zhang,Zhongqing Ma
Pyrolysis polygeneration is one of the promising approaches to convert biomass into bio-gas, bio-char, and bio-oil. In this work, the comparison of the properties of pyrolytic products from terrestrial biomass (poplar wood, PW) and marine biomass (microalgae, Chlorella vulgaris, CV) was carried out. Then, three types of activation agents (e.g., KOH, H 3 PO 4, and ZnCl 2 ) were used to improve the SSA and pore structure of bio-char for the removal of tetracycline hydrochloride (HTC) from wastewater. The yield of bio-char decreased with pyrolytic temperature increasing, while the yield of bio-gas increased. The yield of bio-oil reached the maximum value of 500 ºC. The yields of bio-gas and bio-char of CV were higher than that of PW at different temperatures, while the yield of bio-oil presented an opposite trend. Several nitrogenous chemicals were observed in pyrolytic bio-oil of CV due to thermal degradation of proteins. Among the three type of activation agents (H 3 PO 4 , KOH, and ZnCl 2 ), KOH was the best activation agent to obtain activation carbon with highest SSA and pore volume. The CV-derived activated carbon by using KOH as activation agent presented highest specific surface area (1638.85 m 2 /g) and highest adsorption capacity of HTC (42.7 mg/g). Meanwhile, the CV-500-KOH still retained such high adsorption capacity of HTC (35.8 mg/g) after five cycles, suggesting that the N-doped bio-char possessed the excellent recyclability. In conclusion, compared to the PW-derived bio-char, CV-derived bio-char was a better precursor for production of activation carbon due to the higher N content in CV.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuai Ran,Ji Qi,Xufeng Dong,Hao Huang,Min Qi,Wenjing Dong,Penghui Zhao,Zenghui Zhao,Jingyuan Yang
Controllable preparation of cross-linked mesoporous carbon materials on a large scale remains challenging. In the present work, a simple NaCl-assisted pyrolysis strategy is proposed here to efficiently convert closed pores into open pores in the pyrolysis products of 2-methylimidazole zinc salt nanoparticles/polyacrylonitrile (ZIF-8/PAN) electrospun fibers to prepare 1D cross-linked mesoporous N-rich carbon-based oxygen reduction reaction (ORR) electrocatalyst. The total specific surface area of micropores and mesopores was significantly increased from 162 m 2 /g to 1069 m 2 /g (mesopores: 704 m 2 /g). The ORR catalytic activity of open pore was superior to that of closed pore with more positive onset potential (0.96 vs . 0.85 V) and half-wave potential (0.79 vs . 0.72 V), larger limiting current density (5.23 vs . 3.62 mA cm −2 ) and electron transfer number (3.89 vs . 3.15). Such enhanced performance was attributed to the transformation from closed to open pores which greatly improved the mass transfer performance and the number of active sites.
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高影响因子
危险品化学品经营许可证（带存储）