A method to purify a hydrocarbon gas with hydrogen sulfide as an impurity comprises: (a) charging a chamber with a bed of active-metal carbide of a predetermined mesh-size range; (b) conducting the hydrocarbon gas through the bed of active-metal carbide, forming additional hydrocarbon gas by reaction of the active-metal carbide and the hydrogen sulfide; and (c) filtering from the chamber the hydrocarbon gas without the hydrogen sulfide.

Fuel gas compositions for use in metal fabrication are provided comprising fuel gases comprising a base fuel gas mixed with from about 1% to less than 30% hydrogen.

Fuel gas compositions for use in metal fabrication are provided comprising fuel gases comprising a base fuel gas mixed with from about 1% to less than 30% hydrogen.

A method for recycling CO.sub.2 from CO.sub.2 containing inputs to produce hydrocarbon products includes the steps of (i) capturing CO.sub.2 from at least one CO.sub.2 containing input, at least one of the at least one CO.sub.2 containing input including air; (ii) producing a CO.sub.2 feed stream from the captured CO.sub.2; (iii) reacting the CO.sub.2 feed stream with a H.sub.2 feed stream to produce a methane containing output; and (iv) separating the methane containing output so as to at least provide methane and a first waste output, wherein the first waste output is incinerated or gasified to provide one of the at least one CO.sub.2 containing inputs for step (i).

A method for carbon capture and recycling, the method including the steps of: (i) Capturing CO.sub.2 from at least one CO.sub.2 containing input; (ii) Producing a CO.sub.2 feed stream from the captured CO.sub.2; and (iii) Reacting the CO.sub.2 feed stream with a H.sub.2 feed stream to produce a methane containing output.

A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21° C.

A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21° C.

Fuel gas compositions for use in metal fabrication are provided comprising fuel gases comprising a base fuel gas mixed with from about 1% to less than 30% hydrogen.

Fuel gas compositions for use in metal fabrication are provided comprising fuel gases comprising a base fuel gas mixed with from about 1% to less than 30% hydrogen.

A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21 C.