Removal of contaminants from gas using zeolite SSZ-36, zeolite SSZ-39, or zeolite SSZ-45

A method for removing a contaminant from a feed gas stream, wherein the feed gas stream includes a methane, an ethane, a carbon dioxide, from 20 to 10,000 wppm water, and from 4 to 1000 wppm hydrogen sulfide, comprising:

• alternating an input of the feed gas stream between an at least two beds of one or more adsorbent particles made from a homogeneous mixture, wherein the one or more adsorbent particles comprise a zeolite SSZ-36, a zeolite SSZ-39, a zeolite SSZ-45, or a combination thereof;
• wherein the feed gas stream contacts one of the at least two beds at a given time in an adsorption step and a tail gas stream is simultaneously vented from another of the at least two beds in a desorption step;
• wherein a contacting in the one of the at least two beds occurs at a feed pressure of from about 345 kPa to about 6895 kPa for a sufficient time to preferentially adsorb the contaminant from the feed gas stream;
• thereby producing a product gas stream containing no greater than about 2 mol % of the carbon dioxide, at least about 10 wppm of the water, at least about 65 mol % of the methane recovered from the feed gas stream, at least about 25 mol % of the ethane recovered from the feed gas stream, no greater than about 1 wppm of the hydrogen sulfide, and no greater than about 1 wppm carbonyl sulfide;
• and
• wherein the feed gas stream is input at a feed end of each of the at least two beds, the product gas stream is removed from a product end of each of the at least two beds, and the tail gas stream is vented from the feed end of the at least two beds.