TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The core is a substantially non-permeable, solid core. The adsorbent coating has a thickness of less than 1000 microns or less than 500 microns and greater than 1 micron or greater than 25 micron, which coating thickness also has uniformity such that a thickness standard deviation is less than 40% of the thickness. The adsorbent coating comprises a microporous material. The microporous material comprises zeolites comprising DDR, CHA, MFI, Beta, and/or FAU, metal organic frameworks, aluminophosphates, silicoaluminophosphates, zeolitic imidazolate frameworks, and/or carbons. The adsorbent coating comprises a mixed matrix material. The mixed matrix material is a polymer film comprising a polymer comprising silicone rubber and polyimides, and further comprises particles of zeolite comprising DDR, CHA, MFI, Beta, and/or FAU. In the structured adsorbent particle or module, adsorbent coating is comprised of an intergrown film of adsorbent crystals grown directly on the exterior surface of the low permeability core. The adsorbent crystals are comprised of a zeolite comprising DDR, MFI, and/or CHA. The length to maximum cross-sectional dimension of the particle is at least 5:1. In the structured adsorbent module, an end-to-end dimension of the module (in the direction of adsorbent preferred longitudinal orientation of the particles) is 5-100 cm. The ordered adsorbent bed of particulate adsorbent particles comprises locally structured ordered regions in which the particulate adsorbent particles are laid down in the ordered configuration of substantially longitudinally extensive, substantially aligned gas channels. The adsorbent particles are in the form of hollow cylinders or hollow prismatic polygonal shapes having a central gas passage. The adsorbent particles are in the form of prismatic polygonal shapes having cross-sectional irregularities that preclude maximal face-to-face contact of the particles in the ordered configuration. The cross-sectional irregularities comprise irregular lengths of polygonal sides and/or irregular vertex angles. The adsorbent particles have surface irregularities in the form of uniform roughness that preclude maximal face-to-face contact of the particles in the ordered configuration. The adsorbent particles have a length to maximum cross-sectional dimension of the particle of at least 5:1. The adsorbent particles have a longitudinal dimension of at least 20 mm. The gas mixture is natural gas and the at least one contaminant is carbon dioxide, or hydrogen sulfide. Preferred Method - The mass is supported in a module configuration by an external support or by cohering the particles in the mass. The adsorbent particle is comprised of a thin film adsorbent coating on an exterior of a low permeability core. The adsorbent particles have a length to maximum cross-sectional dimension of the particle of at least 2:1 and are positioned in the adsorbent bed with a void fraction not more than 30%, and in an ordered configuration to provide substantially longitudinally extensive, substantially aligned gas channels by which the gas mixture to be separated can access the adsorbent material along the length of at least a proportion of the particles to cause adsorption of at least some of the contaminants and to form a purified gas product having a reduced content of the adsorbed contaminant material. The gas stream is contacted with locally structured regions of the adsorbent particles laid down in the adsorbent bed in an ordered configuration to provide the substantially longitudinally extensive, substantially aligned gas channels to cause adsorption of at least some of the contaminants and to form a purified natural gas product having a reduced content of the adsorbed contaminant material. The locally structured regions comprise particles formed by adhering together the particles with an adhesive that is removed prior to contact with the gas stream. The particles are consolidated to form a coherent mass by laying down the particles in the ordered configuration in a container and adhered the particles together. The particles are adhered together by means of an adhesive.