| 摘要 |
Prodn. of synthesis gas is effected in two stages: (i) catalytic partial oxidn. of a feed mixt. comprising hydrocarbon feed stream, H2O and O2-contg. gas; the preheated feed mixt. being contacted with a monolithic (honeycomb-type) catalyst (I) comprising Pd and Pt (andopt. Rh) on a refractory metal oxide, and (ii) catalytic steam reforming of the first-stage effluent over a Pt-Rh steam reforming catalyst. Specifically, the feed mixt. to stage (i) is controlled to give an H2O:C ratio of 0.5-5 and an O2:C ratio of 0.2-0.8, and the step is carried out at 1-142 atm. and at such temps. that at least part of (I) is at at least 121 deg.C above the ignition temp. of the inlet stream, providing cracking of any unoxidised 5C + hydrocarbons to light (4C or below) hydrocarbons. The specifically claimed embodiments relate to integrated processes utilising the H2-rich product gas for the prodn. of (A) ammonia, (B) methanol, (C) SNG and (D) liq. hydrocarbons. Very low catalytic metal loadings may be used. Operation is at relatively low H2O:C and O2:C ratios, without catalyst fouling by C deposition. |
