A series of Rh-substituted lanthanum zirconate pyrochlores doped with different loadings of Y (A-site or B-site) were synthesized and studied for methane steam reforming (MSR) under low steam-to-carbon ratios (S/C = 1.0). This study mainly focuses on Y doping in the pyrochlore structure and its potential influence on the catalytic activity of Rh and carbon formation during reaction. XANES data showed that doping Y into the pyrochlore resulted in an occupancy that was predominately located in the B-site, but overall the distribution of Y in each site was similar in all catalysts despite the loadings of Y and stoichiometry of the constituent pyrochlore cations. Activity testing showed that 4 wt% Y doping at La-site led to higher activity at high flow rate and feed dilution, and high selectivity to synthesis gas. This catalyst showed strong resistance to coking under a long-term stability test (300 h) and a series of low S/C ratios MSR.

合成了一系列掺有不同Y量的铑取代的锆酸镧锆烧绿石（A-位或B-位），并研究了在低汽碳比（S / C = 1.0）下的甲烷蒸汽重整（MSR）。 。这项研究主要集中在烧绿石结构中的Y掺杂及其对反应过程中Rh的催化活性和碳形成的潜在影响。XANES数据显示，将Y掺杂到烧绿石中会导致占位主要位于B位，但是尽管Y的负载量和烧绿石阳离子的化学计量，但所有催化剂中每个位点的Y总体分布都是相似的。活性测试表明，在La部位掺杂4 wt％的Y可以在高流速和进料稀释下产生更高的活性，并且对合成气具有高选择性。