| 摘要 |
An improved supported catalyst containing mixed strontium and other alkaline earth oxides deposited on a sintered low surface area porous catalyst carrier (or support) precoated with mixed lanthanum and other rare earth oxides, represented by the formula: AaSrOb(x)/RcLaOd(y)/S, wherein, A is alkaline earth element selected from Be, Mg, Ca, Ba or a mixture thereof; Sr is strontium; O is oxygen; R is rare earth element selected from Ce, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu or a mixture thereof; La is lanthanum; S is catalyst support selected from sintered low surface area porous refractory inert solids comprising of alumina, silica, silica-alumina, silicon carbide, zirconia, hafnia or a mixture thereof; a is A/Sr mole ratio in the range of about 0.01 to about 10; b is number of oxygen atoms needed to fulfill the valence requirement of alkaline earth elements (Aa Sr); c is R/La mole ratio in the range of about 0.01 to about 10; d is number of oxygen atoms needed to fulfill the valence requirement of rare earth elements, (RcLa); y is weight percent loading of rare earth oxides (RcLaOd) precoated on the support in the range of about 0.5 wt % to about 50 wt % and x is wt % loading of alkaline earth oxides (AaSrOb) deposited on the precoated support in the range of about 0.4 wt % to about 40 wt %.
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