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Effect of calcination temperature on catalytic performance of ZnGaZrO x /SAPO-34
Received date: 2023-04-24
Online published: 2024-02-06
In the hydrogenation of CO2 to low-carbon olefins（C2=-C4=），the calcination temperature of the bifunctional catalyst has significant effects on its catalytic performance.Based on this，ZnGaZrO x oxides were prepared by co-precipitation method and SAPO-34 molecular sieves were prepared by hydrothermal method，and then both of them were milled to produce ZnGaZrO x /SAPO-34 bifunctional catalysts，and the effects of calcination temperature on the physicochemical properties and catalytic performance of ZnGaZrO x and SAPO-34 were investigated.It was found by XRD，XPS，H2/CO2/NH3-TPD，SEM，N2 adsorption-desorption and in situ DRIFTS characterization that during the preparation of ZnGaZrO x，when the calcination temperature was 650 ℃，ZnGaZrO x had the strongest activation ability of H2 and CO2 adsorption，and it could effectively increase the rate and concentration of the generation of HCOO* and CH3O* to promote the methanol product generation.During the preparation of SAPO-34，when the calcination temperature was 450 ℃，the molecular sieve had the largest specific surface area，the smallest grain size，and the weakest acidity of the strong acid site，which could effectively avoid the secondary hydrogenation of low-carbon olefins，thus obtaining higher selectivity of low-carbon olefins.The ZnGaZrO x /SAPO-34 bifunctional catalysts synthesized under the optimal conditions showed a CO2 conversion of 28.3%，a CO selectivity of only 44.6%，a C2=-C4= selectivity of 84.4%，a C2=-C4= yield of as high as 13.2% at a reaction temperature of 390 ℃，a pressure of 3 MPa，and an airspeed of 3 600 mL/（g∙h）.And the catalytic performance did not decay significantly within 100 h of reaction.This work provided a new research idea for the modification of bifunctional catalysts.
Key words： CO2 hydrogenation; light olefins; calcination temperature; oxygen vacancy; acidity
YANG Kun , REN Qixia , DONG Yonggang , LIU Fei , YAO Mengqin , CAO Jianxin . Effect of calcination temperature on catalytic performance of ZnGaZrO x /SAPO-34[J]. Inorganic Chemicals Industry, 2024 , 56(2) : 136 -145 . DOI: 10.19964/j.issn.1006-4990.2023-0233
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