Compound catalyst of ReMoSx@HSSZ-39 and SAPO-34 zeolites for high performance conversion of CO2 to C2-4 hydrocarbons

We report here a high-performance catalyst ReMoS x @HSSZ-39 compounded with SAPO-34 for conversion of CO 2 to C 2-4 hydrocarbons, in which the ReMoS x clusters are responsible for highly efficient hydrogenation of CO 2 to methanol as the intermediate and then the surrounding zeolitic acid sites for further conversion of methanol to hydrocarbons. The investigation finds that uniform ReMoS x clusters can be reliably fabricated in zeolitic cages by co-introduction of rhenium and molybdenum species into the HSSZ-39 zeolite and followed by sulfidation, which constitutes an intimate bifunction catalyst through better cooperation of ReMoS x clusters and the zeolitic acid sites. Compared with MoS x @HSSZ-39, the introduction of rhenium significantly suppresses CO generation. By mixing some SAPO-34 zeolite, with increased density of protonic acid, more than 86 % C 2-4 hydrocarbons in organic products and only 21 % CO at 32.5 % of CO 2 conversion are obtained and the composite catalyst shows excellent stability with more than 95 % C 2-4 hydrocarbons in organic products, less than 30 % CO and above 26.6 % of CO 2 conversion after 1000 h on stream.