A simple catalytic device that is easily installed into vehicles, small engines, and industrial exhaust stacks is provided. The simple catalytic device has a ridged and stable backbone structure that withstands expected mechanical forces. In one example, the backbone is a highly gas permeable mesh or screen. A fibrous material is disposed on the backbone, with a catalytic material coating applied to the fibrous material. The catalytic device is constructed to be installable in an exhaust path, where it provides a catalytic conversion for non-particulate matter.