Metal–support interactions in surface-modified Cu–Co catalysts applied in higher alcohol synthesis

Abstract

Cu–Co-based model catalysts were prepared by a sophisticated alkali-free synthesis method and tested in the conversion of synthesis gas to higher alcohols. MoO3-coated alumina was used as the support, providing both high specific surface area and strongly interacting sites for the deposition of the active metals.

Cobalt–copper based catalysts for higher terminal alcohols synthesis via Fischer–Tropsch reaction

“…Various types of heterogeneous catalysts including Rh noble metal [11][12][13][14][15] , CoCu [16][17][18][19][20][21][22][23][24][25][26][27][28] and CuZn [29,30] mixed metals as well as hydrodesulfurization-type MoS 2 [31][32][33] were all tested for higher alcohols synthesis via CO hydrogenation. CoCu-based catalysts were found to be among the most promising ones for various reasons.…”

“…After the initial reports by IFP, a large number of patents (filed by Mobil Oil, BP and Chem Systems) [40][41][42][43] and papers [17][18][19][20]44,45] catalysts for higher alcohols saw the light of the day. More recently, such catalysts have been examined in detail [21][22][23][24][25][26][27][28][29][30][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] . It seems to be clear by now that the detailed catalyst formulation as well as the methods of their preparation are key to the performance for higher alcohols synthesis.…”

On the role of cobalt carbidization in higher alcohol synthesis over hydrotalcite-based Co-Cu catalysts

“…The reduction of cobalt oxide to metallic Co 0 requires higher temperatures resulting in a flat and broad peak in the range of 300-650 °C. Obviously, its reduction is favored in the presence of Cu 0 due to hydrogen spillover [34][35][36]. A degree of reduction of about 96.4% derived from the overall H2 consumption confirmed complete reduction of both Co oxide and Cu oxide up to 650 °C.…”

Research progress of catalysts for synthesis of low-carbon alcohols from synthesis gas

“…Therefore, the modication of F-T synthesis catalysts to synthesize low-carbon alcohols has received extensive attention for research, among which Cu-Co and Cu-Fe are the two types of catalysts widely studied. [24][25][26][27] The modied Fischer-Tropsch Cu-Co catalyst was developed by the French Petroleum Institute, and the synthesis products are mainly C1-C6 linear primary alcohols, whose product distribution is in line with the Anderson-Schulz-Flory (ASF) distribution of F-T. As to the catalytic mechanism, it is generally believed that Cu-Co catalysts for the synthesis of low-carbon alcohols have two types of active centers. Among them, Co is used for dissociative adsorption of CO to generate alkyl chains, and Cu is used for non-dissociative adsorption of CO to oxidize alkyl chains.…”