A producer gas cleaning device comprising: a first vertically positioned tube having a perimeter, an interior wall, an exterior wall, a proximal end and a distal end comprising: a tubular filter bed chamber at the distal end of the first vertically positioned tube; an inlet for carbon-based material located in the upper half of the filter bed chamber; a spent carbon outlet at or near the bottom of the first vertically positioned tube; a gas inlet located between the spent carbon outlet and the filter bed chamber; a tubular microwave chamber located above the filter bed chamber and having a top and a bottom, said microwave chamber comprising: a permeable top comprising a microwave absorbing material, wave guides located around the perimeter through which microwaves can be introduced into the device, and a magnetron and an isolator attached to each wave guide; wherein the bottom of the microwave chamber is connected to a top of the filter bed chamber; a first catalytic chamber connected and distal to the microwave chamber; and a gas outlet connected to the first catalytic chamber; and a second catalytic chamber connected to the first catalytic chamber, said second catalytic chamber comprising a second vertically positioned tube having a perimeter, an interior wall, an exterior wall, a proximal end and a distal end. a first vertically positioned tube having a perimeter, an interior wall, an exterior wall, a proximal end and a distal end comprising: a tubular filter bed chamber at the distal end of the first vertically positioned tube; an inlet for carbon-based material located in the upper half of the filter bed chamber; a spent carbon outlet at or near the bottom of the first vertically positioned tube; a gas inlet located between the spent carbon outlet and the filter bed chamber; a tubular microwave chamber located above the filter bed chamber and having a top and a bottom, said microwave chamber comprising: a permeable top comprising a microwave absorbing material, wave guides located around the perimeter through which microwaves can be introduced into the device, and a magnetron and an isolator attached to each wave guide; wherein the bottom of the microwave chamber is connected to a top of the filter bed chamber; a first catalytic chamber connected and distal to the microwave chamber; and a gas outlet connected to the first catalytic chamber; and a tubular filter bed chamber at the distal end of the first vertically positioned tube; an inlet for carbon-based material located in the upper half of the filter bed chamber; a spent carbon outlet at or near the bottom of the first vertically positioned tube; a gas inlet located between the spent carbon outlet and the filter bed chamber; a tubular microwave chamber located above the filter bed chamber and having a top and a bottom, said microwave chamber comprising: a permeable top comprising a microwave absorbing material, wave guides located around the perimeter through which microwaves can be introduced into the device, and a magnetron and an isolator attached to each wave guide; a permeable top comprising a microwave absorbing material, wave guides located around the perimeter through which microwaves can be introduced into the device, and a magnetron and an isolator attached to each wave guide; wherein the bottom of the microwave chamber is connected to a top of the filter bed chamber; a first catalytic chamber connected and distal to the microwave chamber; and a gas outlet connected to the first catalytic chamber; and a second catalytic chamber connected to the first catalytic chamber, said second catalytic chamber comprising a second vertically positioned tube having a perimeter, an interior wall, an exterior wall, a proximal end and a distal end.